<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>权限管理</el-breadcrumb-item>
            <el-breadcrumb-item>角色列表</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片视图区域 -->
        <el-card>
            <el-row>
                <el-col>
                    <el-button type="primary" @click="addDialogVisible=true">添加角色</el-button>
                </el-col>
            </el-row>

            <!-- 角色列表区域 -->
            <el-table :data="rolelist" border stripe>
                <!-- 展开列 -->
                <el-table-column type="expand">
                    <template slot-scope="scope">
                        <el-row :class="['bdbottom',i1===0?'bdtop':'','vcenter']" v-for="(item1,i1) in scope.row.children" :key="item1.id">
                            <!-- 渲染一级权限 -->
                            <el-col :span="5">
                                <el-tag closable @close="removeRightById(scope.row,item1.id)">{{item1.authName}}</el-tag>
                                <i class="el-icon-caret-right"></i>
                            </el-col>
                            <!-- 渲染二级和三级权限 -->
                            <el-col :span="19">
                                <el-row :class="[i2===0?'':'bdtop','vcenter']" v-for="(item2,i2) in item1.children" :key="item2.id">
                                    <el-col :span="6">
                                        <el-tag type="success" closable @close="removeRightById(scope.row,item2.id)">{{item2.authName}}</el-tag>
                                        <i class="el-icon-caret-right"></i>
                                    </el-col>
                                    <el-col :span="18">
                                        <el-tag type="warning" v-for="(item3,i3) in item2.children" :key="item3.id" closable @close="removeRightById(scope.row,item3.id)">{{item3.authName}}</el-tag>
                                    </el-col>
                                </el-row>
                            </el-col>
                        </el-row>
                    </template>
                </el-table-column>
                <!-- 索引列 -->
                <el-table-column label="#" type="index" align="center" header-align="center">
                </el-table-column>
                <el-table-column header-align="center" align="center" prop="roleName" label="角色名称">
                </el-table-column>
                <el-table-column header-align="center" align="center" prop="roleDesc" label="角色描述"></el-table-column>
                <el-table-column header-align="center" align="center" label="操作" width="300px">
                    <template slot-scope="scope">
                        <!-- 修改按钮 -->
                        <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.id)">编辑</el-button>
                        <!-- 删除按钮 -->
                        <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeRoleById(scope.row.id)">删除</el-button>
                        <!-- 分配角色按钮 -->
                        <el-button size="mini" type="warning" icon="el-icon-setting" @click="showSetRightDialog(scope.row)">分配权限</el-button>
                    </template>
                </el-table-column>
            </el-table>
        </el-card>

        <!-- 分配权限的对话框 -->

        <el-dialog title="分配权限" :visible.sync="setRightDialogVisible" width="50%" @close="setRightDialogClosed">
            <!-- 树形控件 -->
            <el-tree :data="rightslist" :props="treeProps" show-checkbox node-key="id" default-expand-all :default-checked-keys="defKeys" ref="treeRef"></el-tree>
            <span slot="footer" class="dialog-footer">
                <el-button @click="setRightDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="allotRights">确 定</el-button>
            </span>
        </el-dialog>

        <!-- 添加用户的对话框 -->
        <el-dialog title="添加用户" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
            <!-- 内容主体区域 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="80px">
                <el-form-item label="角色名称" prop="roleName">
                    <el-input v-model="addForm.roleName"></el-input>
                </el-form-item>
                <el-form-item label="角色描述" prop="roleDesc">
                    <el-input v-model="addForm.roleDesc "></el-input>
                </el-form-item>
            </el-form>
            <!-- 底部区域 -->
            <span slot="footer" class="dialog-footer">
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addRole">确 定</el-button>
            </span>
        </el-dialog>

        <!-- 修改角色的对话框 -->
        <el-dialog title="修改角色" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
            <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="80px">
                <el-form-item label="角色名称" prop="roleName">
                    <el-input v-model="editForm.roleName"></el-input>
                </el-form-item>
                <el-form-item label="角色描述" prop="roleDesc">
                    <el-input v-model="editForm.roleDesc"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="editDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="editRoleInfo">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>
export default {
    data () {
        return {
            // 所有角色列表数据
            rolelist: [],
            // 控制添加用户对话框的显示与隐藏
            addDialogVisible: false,
            // 添加用户的表单数据
            addForm: {
                roleName: "",
                roleDesc: "",
            },
            // 添加表单的验证规则对象
            addFormRules: {
                roleName: [
                    { required: true, message: '请输入角色名称', trigger: 'blur' }],
                roleDesc: [
                    { required: true, message: '请输入角色描述', trigger: 'blur' }],
            },
            // 控制修改角色对话框的显示与隐藏
            editDialogVisible: false,
            // 查询到的角色信息对象
            editForm: {},
            // 修改表达的验证规则对象
            editFormRules: {
                roleName: [
                    { required: true, message: '请输入角色名称', trigger: 'blur' }
                ],
                roleDesc: [
                    { required: true, message: '请输入角色描述', trigger: 'blur' }
                ],
            },
            // 控制分配权限对话框的显示与隐藏
            setRightDialogVisible: false,
            // 所有权限的数据
            rightslist: [],
            // 树形控件的属性绑定对象
            treeProps: {
                label: 'authName',
                children: 'children'
            },
            // 默认选中的节点Id值数组
            defKeys: [],
            // 当前即将分配的角色id为0
            roleId: ''
        }
    },
    created () {
        this.getRolesList()
    },
    methods: {
        async getRolesList () {
            const { data: res } = await this.$http.get('roles')
            if (res.meta.status !== 200) {
                return this.$message.error('获取角色列表失败!')
            }
            this.rolelist = res.data
        },
        // 监听添加角色对话框的关闭事件
        addDialogClosed () {
            this.$refs.addFormRef.resetFields()
        },
        // 点击按钮，添加新角色
        addRole () {
            this.$refs.addFormRef.validate(async valid => {
                if (!valid) return
                // 可以发起添加角色的网络请求
                const { data: res } = await this.$http.post('roles', this.addForm)
                if (res.meta.status !== 201) {
                    this.$message.error("添加角色失败!")
                }
                this.$message.success("添加角色成功!")
                // 隐藏添加角色的对话框
                this.addDialogVisible = false
                // 重新获取角色的列表
                this.getRolesList()
            })
        },
        // 展示编辑角色的对话框
        async showEditDialog (id) {
            const { data: res } = await this.$http.get('roles/' + id)
            if (res.meta.status != 200) {
                return this.$message.error("查询角色信息失败!")
            }
            this.editForm = res.data
            this.editDialogVisible = true
        },
        // 监听修改角色对话框的关闭事件
        editDialogClosed () {
            this.$refs.editFormRef.resetFields()
        },
        // 修改角色信息并提交
        editRoleInfo () {
            this.$refs.editFormRef.validate(async valid => {
                if (!valid) return
                // 发起修改角色信息的数据请求
                const { data: res } = await this.$http.put('roles/' + this.editForm.roleId, { roleName: this.editForm.roleName, roleDesc: this.editForm.roleDesc })
                if (res.meta.status !== 200) {
                    return this.$message.error('更新角色信息失败！')  // 关闭对话框
                }
                this.editDialogVisible = false
                // 刷新数据列表
                this.getRolesList()
                // 提示修改成功
                this.$message.success('更新角色信息成功!')
            })
        },
        // 根据id删除对应的角色信息
        async removeRoleById (id) {
            // 弹框询问用户是否删除数据
            const confirmResult = await this.$confirm('此操作将永久删除该角色, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).catch(err => err)
            // 如果角色确认删除，则返回的值为字符串confirm
            // 如果角色取消了删除，则返回值为字符串cancel
            if (confirmResult != 'confirm') {
                return this.$message.info('已取消删除')
            }
            const { data: res } = await this.$http.delete('roles/' + id)
            if (res.meta.status !== 200) {
                return this.$message.error('删除角色失败!')
            }
            this.$message.success('删除角色成功!')
            this.getRolesList()
        },
        // 根据Id删除对应的权限
        async removeRightById (role, rightId) {
            // 弹框提示用户是否要删除
            const confirmResult = await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).catch(err => err)
            if (confirmResult !== 'confirm') {
                return this.$message.info('取消了删除')
            }
            const { data: res } = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
            if (res.meta.status !== 200) {
                return this.$message.error('删除权限失败!');
            }
            // this.getRolesList()
            role.children = res.data
        },
        // 展示分配权限的对话框
        async showSetRightDialog (role) {
            this.roleId = role.id
            // 获取所有权限的数据
            const { data: res } = await this.$http.get('rights/tree')

            if (res.meta.status !== 200) {
                return this.$message.error('获取权限数据失败')
            }

            // 把获取到的权限数据保存到data中
            this.rightslist = res.data

            // 递归获取三级节点的Id
            this.getLeafKeys(role, this.defKeys)

            this.setRightDialogVisible = true
        },
        // 通过递归的形式，获取角色下所有三级权限的id，并保存到defKeys数组中
        getLeafKeys (node, arr) {
            // 如果当前node节点不包含children属性，则是三级节点
            if (!node.children) {
                return arr.push(node.id)
            }

            node.children.forEach(item => this.getLeafKeys(item, arr))
        },
        // 监听分配权限对话框的关闭事件
        setRightDialogClosed () {
            this.defKeys = []
        },
        //    点击为角色分配权限
        async allotRights () {
            // ...就是把两个数组合并成一个数组
            const keys = [
                ...this.$refs.treeRef.getCheckedKeys(),
                ...this.$refs.treeRef.getHalfCheckedKeys()
            ]

            const idStr = keys.join(',')

            const { data: res } = await this.$http.post(`roles/${this.roleId}/rights`, { rids: idStr })
            if (res.meta.status !== 200) {
                return this.$message.error('分配权限失败！')
            }
            this.$message.success('分配权限成功!')
            this.getRolesList()
            this.setRightDialogVisible = false
        }
    }
}
</script>

<style lang="scss" scoped>
.el-tag {
    margin: 7px;
}
// 可以直接使用子选择器:nth-child(1)来
.bdtop {
    border-top: 1px solid #eee;
}
.bdbottom {
    border-bottom: 1px solid #eee;
}
.vcenter {
    display: flex;
    align-items: center;
}
</style>